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Radiation Protection Dosimetry 34:39-41 (1990)
© 1990 Oxford University Press

Simultaneous Measurement of Angle of Incidence and Energy in Fast Neutron Fields by CR-39

S. Guldbakke, E. Pitt, A. Scharmann and R. Simmer

Commercial American Acrylics CR-39 (dosimetry grade), partly covered with polypropylene radiators of increasing thickness (step radiator) has been irradiated with monoenergetic neutrons (0.565 - 5 MeV) in parallel beams at various angles of incidence. The step rise has been varied with neutron energy, the maximum thickness of the step-radiator exceeding the maximum recoil proton energy range. The CR-39 detectors have been etched electrochemically and evaluated by a semi-automatic image analysing system (Leitz Autoscope P). By varying the radiator thickness the track density increases up to a saturation track density. The ratio of saturation track density of uncovered CR-39 depends on the angle of incidence. The knowledge of the saturation radiator thickness combined with the angle of incidence allows, on the other hand, the neutron energy to be estimated.


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